lfm
But what would benefit Sonar for sure - make VST midi plugins load in MFX slots - just like DX and VST audio plugins load in audio track plugin slots.
Yes. But...
Following IMHO (at the level of speculations) comes from:
* DX and VST use quite different approaches with MIDI. VST "quantize" MIDI at audio buffer borders and work with "raw" MIDI messages. DX has artificial quantization which unavoidable introduce logical bugs (original design problem) and works with "aggregated" MIDI events ( so "Note On + Note Off -> Note + duration"). (DX also use raw messages for live processing since "duration" is obviously not known)
* internally Sonar works with MIDI in DX framework and just "export" into VST like domain at the very end. Indirect proves: MFX is DX only, some bugs (Yamaha sustain, playback buffer influence on skipped notes, etc.) can only exists in DX way, Lyrics/Text directly accessible in MFX "as is"
So a major change in sonar engine is required, in the part which was not really touched since many many years (developers? licenses?). An attempt to make "aux" like dirty hack can break much more then related Audio functionality, for which Sends exist from the beginning (so corresponding machinery was foreseen).
I hope CW will do this one lucky day. I mean rewrite MIDI engine. I guess everything appear "at once" then: MIDI VST, audio like routing flexibility, absolute time MIDI events locks, updated staff and lyrics views, etc. That can also lead to "negative" changes: discarded DX/MFXes (no more TTS-1 ??), broken CAL scripts ...